Wild Country are a well known manufacturer, have used their stuff for 30 odd years. I may have a couple of those screwgates, but they are a fairly standard bit of kit and not too much difference in brands.
£5 a good price too, but Rock and Run often have good deals as they are just an online company these days after their early days in Ambleside in the mid-80's, they also had the best café over the shop in them days, thankfully the café still does proper food over the counter as I think it saw the disadvantages of a bacon buttie and a pint mug of coffee ordered online